Engine lathe tail stock ram drive



Jan. 8, 1957 s. J. KoRll-:Nl-:K

ENGINE EATHE TAIL sTocK EAM DRIVE 2 Sheets-Sheet 1 Original Filed April 18, 1952 mw vm STEPHEN J. KOP/ENEK INI/EN TOR BYMQ @TTU/@VEN S. J. KORIEN EK ENGINE LATI-1E TAIL. STOCK RAM DRIVE 2 Sheets-Sheet 2 Jan. 8, 1957 Original Filed April 18, 1952 STEP/#EN J, KOP/[NEK INVENTOR.

l BY /W United States Patent O ENGINE LATHE TAIL sToCK RAM DRIVE Stephen J. Korienek, Rosemead, Calif., assignor of onehalf to John G. E. Hogg, El Monte, Calif.

Continuation of abandoned application Serial No. 283,156, April 18, 1952. This application December 8, 1952, Serial No. 324,679

This application is a continuation of an application, Serial No. 283,156, tiled April 18, 1952, now abandoned, and entitled: Engine Lathe Tail Stock Ram Drive.

This invention relates to engine lathes, and particularly to the tail stock mechanism.

Such tail stocks as commonly provided include a ram structure, having a tapered socket for accommodating a center, a drill, a tap, a thread cutter, a rearner, or the like. The ram is movable longitudinally along an axis corresponding to the axis of rotation of the engine headstroke. The tail stock thus causes the tool carried by it to engage the work mounted on the headstroke.

Such devices are usually provided with a lead screw mechanism for advancing and retracting the ram. Such movement is usually at-a slow rate.V

It is one of the objects of this invention to provide a tail stock ram structure that can readily be installed on existing tail stocks, and that can be quickly advanced and retracted.

ln an embodiment of this invention, a mechanism is utilized for operating the ram that is rotatable about an axis transverse to the direction of movement of the ram. It is another object f this invention to make it possible readily to adjust the angular position of that axis with respect to the ram axis so as to bring the operating member` to a convenient location for manipulation.

This invention possesses many otheradvantages, and has other objects which may be made more clearly apparent from a consideration of one embodiment of the invention. For this purpose there is shown a form in the drawings accompanying and forming a part of the present specication. The form will not be described in detail, illustrating the general principles of the invention; but it is to be understood that this detailed description is not to be taken in a limiting sense, since the scope of this invention is best dened `by the appended claims.

Referring to the drawings:

Figi l is a plan View of a tail stock structure incorporating the invention;

Fig. 2 is a sectional View, taken along a plane corresponding to line 2-2 of Fig. l;

Fig. 3 is a sectional view taken along a plane corresponding to line 3-3 of Fig. 2; and

Fig. 4 is a side elevation of a portion of the apparatus, some of the elements being shown in phantom lines.

A tail stock 1 of conventional form is shown as adjustably mounted on longitudinal rails 2 of a lathe bed. This tail stock 1 is provided with a hollow guide portion 3 having a horizontal ybore or opening 4 extending longitudinally through the guide member 3.

A hollow ram 5 is slidable within the opening 4 in the usual manner. This ram is provided at its left-hand end with a tapered socket 6 for the accommodation of a corresponding tapered end of a tool such as a center, drill, tap or reamer. The axis on which the ram 5 is longitudinally movable corresponds to the axis of rotation ofthe head stock not shown).

2,776,590 Patented Jan. 8, 1957 The guide member 3 is split along one edge so that a clamping screw 7 (Fig. l)` may be used for either releasing the ram 5 or clamping it in any desired longitudinal adjustment.

For advancing and retracting the ram 5 when it is released, use is made of a rack and pinion mechanism. T hns a rack 8 has a threaded extension 9, which is engaged with the internal threads at the left-hand end of the opening lll extending longitudinally of the ram 5. Movement ot' the rack 8 toward the left as View in Fig. 2 serves to advance the ram 5 toward the head stock; and corresponding right-hand movement of rack 8 serves to retract ram 5 away from the work.

As shown most clearly in Fig. 3, the rack 8 is made from. cylindrical stock and is supported by the aid of a housing itl. This housing 10 is provided with a through bore 11 for slidingly accommodating the rack 8.

The housing 10 has a threaded projection 12 which is engaged in the threaded end of the aperture 4. A lock nut 13 is disposed on the threaded end 12 to hold the housing lil iirrnly in position on the guide 3. The housing lil can be firmly supported in any angular position with respect to the axis of the ram 5 by appropriate manipulation ofthe nut 13.

The housing 10 is provided with a through bore extending transversely of the bore 11. This through bore has a reduced portion 14 and an enlarged portion 15. (Fig. 3). Between these -bore portions 14 and 15 there is a shoulder 16. The larger bore portion 15 intersects the bore 11 and serves to accommodate a pinion 17. This pinion 17 meshes with the rack 8. It has an external diameter corresponding substantially to the bore 15.

The pinion 17 is mounted on a shaft 18 either by being for-med integrally therewith or by being attached thereto in any appropriate manner.v This shaft 18 is rotatably mounted in bore 15. An extension 19 of the shaft 18 projects through the bore 14.

For operating the shaft 18 and thereby the rack 8, a hand-spoke wheel is provided. The spoke wheel has a hub 19 which is attached Ato shaft 1S as by a set screw 2t) |(Fig. l). Attached to this hub are a plurality of spokes 21 angularly spaced about the axis of the shaft 18 and provided with ball ends 22 for ready manual manipulation.

The left-hand end surface 23 of the hub 19 is urged against the housing 10 by the aid of a compression spring 24. This compression spring surrounds the shaft extension 19. Its right-hand end abuts the left-hand end of housing 10. A round nut 25 is threaded on the exposed end of extension 19 for contining the compression spring upon the extension 19. The compression spring accordingly urges the left-hand end of pinion 17 against the shoulder 16.

Removal of the pinion and shaft structures 'are readily effected by unthreading the nut 25 and pulling the shaft structure out of the housing 10. `Replacment can be effected by a reverse operation.

Since there is a threaded engagement between the housing 1t) and guide 3 on the axis of the tail stock, the angular position of the spoke wheel axis can be readily adjusted to be most convenient for an operator.

A knockout plunger 26 (Fig. 2) is slidable within the bore 10 of the ram 5. This knockout structure is attached to the threaded end of a rod 27 guided in a bore formed in the rack 8. The right-hand end of the rod 27 may be provided with a knurled end member 28 which may be driven inwardly to move the plunger 26 to a position to release the tool mounted in socket 6.

Means are provided for selectively limiting or stopping v device is accommodated in a standard 29 attached to the housing 10. This standard rotatably supports a barrel 30 on an axis parallel to the direction of movement of the ram 5. The barrel 30 is restrained against axial move ment by the aid of the cylindrical end 31 of a screw 32 threaded in a radial aperture in the standard 29. This cylindrical projection 31 engages in the annular groove 33 of the barrel 30.

The barrel 30 carries a plurality of adjustable stop screws 34. These stop screws are angularly arranged around the axis of the barrel 30 and are threaded into appropriate threaded apertures in the barrel. Locknuts 3S maintain these stop screws in adjusted position.

Any one of the plurality of stop screws can be placed into active position by rotation of the barrel 30. The barrel is releasably retained in any of its adjusted positions by the aid of a spring pressed detent of the usual form and indicated in general by reference character 36. In the present instance, since there are six stop screws 34, the barrel 30 has six indentations for the accommodation of the spring pressed detent.

The lowermost one of the stop screws 34 is arranged to cooperate with a stop 37 appropriately mounted on the right-hand end of the rack 8. For this purpose, the rack 8 is provided with a reduced portion 38, the right-hand end of which may be upset as indicated at 39 to hold the stop 37 in place. As the rack.8 is advanced inwardly by operation of the pinion 17, the stop 37 ultimately engages the right-hand end of one of the screws 34. In this way, the depth of a drilling, reaming or tapping operation may be determined. By adjusting the angular position of barrel 30, thereby bringing into active operation any of the screws 34, the extent of the advance of the ram is correspondingly determined.

The mode of operation of the apparatus is apparent from the foregoing. The tail stock 1 may be removably clamped with respect to the bed rails 2 of the lathe. The ram can now be rapidly advanced and retracted by appropriate manipulation of the spoke wheel structure 19-21-22. If it is desired to remove a tool or center from the socket 6, the plunger 26 is moved inwardly by the aid of the handle 28. The stop mechanism may be adjusted in any desired manner to limit the forward movement of the ram 5.

Furthermore, in view of the fact that the drive between the pinion 17 and rack member 8 is reversible, any unusual force exerted upon the ram 5 toward the right as viewed in Fig. 2 will cause the ram 5 to move in that direction. This is of considerable importance where the tail stock may be frictionally clamped and the work held in the lathe expands with temperature. With an ordinary tail stock arrangement utilizing threads, the drive is not reversible and accordingly, extreme stresses may be produced upon the mechanism by such temperature expansion.

The inventor claims:

1. In an engine lathe tailstock having a guide provided with threads extending about the rear end of the guide, a holder longitudinally movable in the guide, the cooperating elements of the guide and holder permitting relative angular movement therebetween about the axis of the guide and holder, the combination with said tailstock guide and holder of an attachment, comprising: a housing having threads cooperable with those of the guide for mounting the housing; means for locking the housing in an angularly adjusted position about the axis of the guide; said housing having a bore axially aligned with said guide; a rack guided in the bore, one end of the rack extending beyond one end of the housing bore and being connected to said holder, the other end of the rack extending beyond the other end of said housing bore; a pinion rotatably carried by the housing and extending laterally into the housing bore for cooperation with said rack; a manually manipulable operator secured to the pinion; selectively operable and adjustable multiple abutment means carried by the housing; and a stop carried by said other end of said rack for cooperation with said abutment means.

2. In an engine lathe tailstock having a guide provided with threads extending about the rear end of the guide, a holder longitudinally movable in the guide, the co operating elements of the guide and holder permitting relative angular movement therebetween about the axis of the guide and holder, the combination with said tailstock guide and holder of an attachment, comprising: a housing having threads cooperable with those of the guide for mounting the housing; means for locking the housing in an angularly adjusted position about the axis of the guide; said housing having a bore axially aligned with said guide; a rack guided in the bore, one end of the rack extending beyond one end of the housing bore and being connected to said holder, the other end of the rack extending beyond the other end of said housing bore; said rack having a bore; a knockout plunger rod slidably accommodated in the rack bore, one end of said rod extending through said one end of said rack into said guide, and the other end of said rod extending beyond the other end of said rack; a pinion rotatably carried by the housing and extending laterally into thc housing bore for cooperation with said rack; a manually manipulable operator secured to the pinion; selectively operable and adjustable multiple abutment means carried by the housing; and a stop carried by said other end of said rack for cooperation with said abutment means.

References Cited in the tile of this patent UNITED STATES PATENTS 1,168,063 Derbyshire lan. l1, 1916 1,239,352 Chard Sept. 4, 1917 1,288,351 Wood Dec. 17, 1918 1,591,026 Durkee July 6, 1926 1,664,757 Randolph Apr. 3, 1928 1,704,852 Bath Mar. 12, 1929 2,370,286 Berger Feb. 27, 1945 2,559,311 Meissner July 3, 1951 FOREIGN PATENTS 227,390 Switzerland Sept. 16, 1943 903,290 France Sept. 28, 1945 

